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單項(xiàng)選擇題

While the parallel operation, （） must be used.

A.ammeter
B.voltmeter
C.synchroscope
D.A+B+C

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單項(xiàng)選擇題

When the bearing becomes dry from lack of oil, the motor shaft may heat to （）an extent （） it welds itself to the bearing.

A.either；or
B.neither；nor
C.such；that
D.so；that

單項(xiàng)選擇題

An indicator on the main switchboard should show （） the emergency battery is in service or not.

A.that
B.when
C.if
D.whether

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